A 14-year-old boy in Danvers, Mass., was arrested after the body of math teacher Colleen Ritzer was found in the woods behind his high school Wednesday morning.

Ritzer, 24, was reported missing after she failed to return home Tuesday night and was not answering calls to her cell phone.

Blood was found in a second-floor bathroom at Danvers High School. Danvers schools were closed Wednesday while authorities investigated.

A short time later, Ritzer’s body was found behind the school.

The teen boy was also reported missing on Tuesday when he failed to come home after school. Authorities picked up the teen while he was walking on a road in neighboring Topsfield at 12:30 a.m. Wednesday.

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The 14-year-old will be arraigned on a murder charge, according to Essex County District Attorney Jonathan Blodgett.

Blodgett did not say how Ritzer died. The investigation into her death in ongoing.

High school student Kendall Meehan told the Boston Herald that families were alerted by robo-telephone calls on Wednesday morning.

“It’s just terrifying,” Meehan said. “Nothing like this ever happens in Danvers.”

Ritzer is the second teacher in America to be killed this week. On Monday, a teacher in Sparks, Nev., was shot at a middle school while he was protecting his students from a 12-year-old gunman.